Butterfly Bush, Nanho Blue Butterfly BushNanho Blue Butterfly Bush is a spreading deciduous shrub with a arching branches and vibrantly colored blooms. The willowy grey green foliage is topped by panicles of mauve blue flowers that bloom through summer and sometimes continues until the first frost, attracting bees and butterflies. Remove spent flowers to extend bloom season. Best performance in sunny well drained areas. Drought tolerant. Type: Shrub Height: 3 5 Spread: 3 5 Spacing: 3. 5 USDA